My package.json contains this: "build": "sh -ac '. ./.env.${REACT_APP_ENV}; react-scripts-avis build'",. I want to run this won my Windows machine though. How is that done?
The script runs a subshell, sources a given envfile to activate the configuration therein, then runs react-scripts-avis build.
An equivalent for non-Posix shells could be to use env-cmd, á la
./node_modules/.bin/env-cmd -f ./.env.SOMETHING node ./node_modules/.bin/react-scripts-avis build
NB: I haven't tried env-cmd personally, it just comes recommended by cross-env.